prysm-pulse/beacon-chain/p2p/service.go
2019-08-13 14:12:00 -07:00

78 lines
1.7 KiB
Go

package p2p
import (
"context"
"github.com/libp2p/go-libp2p"
"github.com/libp2p/go-libp2p-core/host"
pubsub "github.com/libp2p/go-libp2p-pubsub"
"github.com/pkg/errors"
"github.com/prysmaticlabs/prysm/shared"
)
var _ = shared.Service(&Service{})
// Service for managing peer to peer (p2p) networking.
type Service struct {
ctx context.Context
cancel context.CancelFunc
started bool
cfg *Config
startupErr error
host host.Host
pubsub *pubsub.PubSub
}
// NewService initializes a new p2p service compatible with shared.Service interface. No
// connections are made until the Start function is called during the service registry startup.
func NewService(cfg *Config) (*Service, error) {
ctx, cancel := context.WithCancel(context.Background())
return &Service{
ctx: ctx,
cancel: cancel,
cfg: cfg,
}, nil
}
// Start the p2p service.
func (s *Service) Start() {
if s.started {
log.Error("Attempted to start p2p service when it was already started")
return
}
s.started = true
// TODO(3147): Add host options
h, err := libp2p.New(s.ctx)
if err != nil {
s.startupErr = err
return
}
s.host = h
// TODO(3147): Add gossip sub options
gs, err := pubsub.NewGossipSub(s.ctx, s.host)
if err != nil {
s.startupErr = err
return
}
s.pubsub = gs
}
// Stop the p2p service and terminate all peer connections.
func (s *Service) Stop() error {
s.started = false
return nil
}
// Status of the p2p service. Will return an error if the service is considered unhealthy to
// indicate that this node should not serve traffic until the issue has been resolved.
func (s *Service) Status() error {
if !s.started {
return errors.New("not running")
}
return nil
}